puerto rico are american citizens, and have been for almost a century. and many can't tell you why. how did part of the spanish empire end up with american citizens, american military bases, american industry, and the american flag flying along side it's own star and stripes. the colony fell in the united states lapse after the war with spain, and the united states has never thought very much with what to do with puerto rico or puerto ricans after the war was over. it brought evolutionary change legally, economically, culturally. puerto rico obtained self government while high level cases are judged in high level courts, citizens from birth have served in large numbers in every war from the last century, yet don't get to choose the president, have a vote in congress or pay federal income tax.